# Photons and perfect mirror

A perfect mirror means, that all the photons which collided with the mirror will be reflected in the same amount, with the same energy and with the same - except sign - angle. Will the mirror get an impulse from the photons?

• There are many similar questions with photons and mirror... it would be great if the Title specifically referred to whether mirror gets an impulse Mar 16 at 21:20
• @blanci PSE is a really well designed software and it allows you to edit questions. Mar 16 at 21:30
• @ HolgerFielder thanks. I’m worried whether reference links to this question would get messed if we change title? Mar 16 at 21:46

Assuming the light is incedent normally the change in the photon momentum is $2h\nu/c$, and consequently the momentum of the mirror will change by the same amount.